When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
The engine ran great until I put the the new (GM) alt on. Now it will not fire. I chased a few wires and found several that may be shorting out. I unhooked the Alt just in case that was the problem. Still no go.
#1 should go to your ignition switch 12V from the battery.
#2 energizes the coil from the ignition switch to start the truck.
#3 should go to the positive of your coil.